JP2010009066A - Flat display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat display device that can reduce the cost of a product. <P>SOLUTION: An optical filter which is stuck on a display-side surface of a flat display panel with a transparent adhesive and has an electromagnetic wave blocking layer, laminated more from the flat display side than on an infrared-radiation absorbing and color-tone correcting layer is such that an outer edge of the electromagnetic wave blocking layer is exposed from the infrared-radiation absorbing and color-tone correcting layer, and the exposed portion is constituted as a ground connecting portion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a configuration of a flat display device.

  The flat display device includes a thin flat display panel such as a plasma display panel (PDP) or a field emission display panel (FED).

  For example, the PDP has a structure in which a pair of front substrate and rear substrate are arranged so as to face each other in parallel, and the periphery of the discharge space between them is sealed.

  In the reflective AC type PDP, a plurality of row electrode pairs that perform surface discharge (display discharge) and a dielectric layer that covers the row electrode pairs are formed on the inner surface of the front substrate, and face the front substrate of the rear substrate. A column electrode that is arranged in a direction orthogonal to the row electrode pair and performs selective discharge between one row electrode of the row electrode pair and a column electrode protective layer that covers the column electrode are formed on the inner surface side A partition wall is formed between the front substrate and the rear substrate to divide the discharge space for each discharge cell. Within each discharge cell, phosphor layers colored in three primary colors of red, green, and blue are sequentially arranged. It has a structure formed to line up.

  FIG. 1 is a cross-sectional side view illustrating a conventional flat display device to which a flat display panel such as the above-described PDP is attached.

  In this conventional display device, a flat display panel 3 is fixed by an adhesive sheet 4 on the front side (upper side in the figure) of a chassis 2 attached to the front side of the rear case 1.

  An inner flange portion 5A is formed at the front end portion of the frame 5 attached to the front surface side peripheral portion of the chassis 2 so as to surround the flat display panel 3, and a gasket 6 is formed on the front surface side of the inner flange portion 5A. A front filter (panel protection plate) 7 is attached with the metal plate 8 interposed therebetween.

  Reference numeral 9 denotes a front case of the display device.

  FIG. 2 is a side view schematically showing the configuration of the front filter (panel protection plate) 7 of the display device.

  In FIG. 2, the front filter (panel protection plate) 7 includes an electromagnetic wave shielding layer (conductive mesh) 7B formed on the glass substrate 7A, an antireflection layer 7C formed on the electromagnetic wave shielding layer 7B, It is comprised by the infrared rays absorption and color tone correction layer 7D formed in the back side of the glass substrate 7A (for example, refer patent document 1).

  In the conventional flat display device as described above, the front filter (panel protection plate) arranged on the front side of the flat display panel is an electromagnetic wave generated from a film for preventing reflection of external light or the flat display panel on the glass substrate. In addition, since it is configured by being attached with a film that blocks infrared rays, it is very expensive. For this reason, the product price of the flat display device increases.

JP-A-11-219122

  One object of the present invention is to solve the problems of the conventional flat display device as described above.

  A flat display device according to the present invention (the invention according to claim 1) is attached to a flat display panel and a display side surface of the flat display panel with a transparent adhesive, and an electromagnetic wave blocking layer is formed from an infrared absorption and color tone correction layer. And an optical filter formed by laminating on the flat display panel side, an outer edge portion of the electromagnetic wave blocking layer of the optical filter is exposed from the infrared absorption and color tone correction layer, and this exposure is performed. This part is characterized in that it is a ground connection part.

It is a sectional side view which shows the structure of the conventional flat display apparatus. It is a schematic side view which shows the structure of the conventional front filter. It is a sectional side view which shows an example in embodiment of this invention. It is a schematic side view which shows the structure of the optical filter in the example. It is a top view of the optical filter in the example. It is a top view which shows the other example of an optical filter. It is a top view which shows the other example of an optical filter. It is a top view which shows the other example of an optical filter. It is a side view of the optical filter.

  The flat display device according to the present invention is a flat display device having a flat display panel, and the best embodiment is a flat display device in which a protective sheet is attached to the display side surface of the flat display panel. is there.

  The flat display device according to this embodiment includes a protective panel for protecting the display surface of the flat display panel as in the past by attaching the protective sheet so as to be integrated with the display surface of the flat display panel. Since there is no need to provide a separate flat display panel, the number of components can be reduced and the support structure of the flat display panel can be simplified, thereby reducing the cost of the product.

[Example 1]
FIG. 3 is a side sectional view showing a first example of the flat display device according to the embodiment of the present invention.

  In FIG. 3, the same reference numerals as those in FIG. 1 are assigned to the same structural portions as those in the conventional apparatus in FIG.

  In the flat display device in this example, the flat display panel 3 is supported on the chassis 2 via an elastic sheet 14 formed of a foamed material such as foamed rubber having a hardness of 30 ° or less that absorbs heat dissipation and distortion during mounting. The optical filter 17 is adhered as a protective sheet on the display side surface of the flat display panel 3.

  As schematically shown in FIG. 4, the optical filter 17 includes an infrared ray absorption / color tone correction sheet 17B laminated on an electromagnetic wave shielding sheet 17A, and an external light reflection preventing agent on the infrared ray absorption / color tone correction sheet 17B. The sheet 17C is further laminated.

  The vertical and horizontal dimensions of the infrared ray absorption / color tone correction sheet 17B and the external light antireflection sheet 17C are slightly smaller than those of the electromagnetic wave shielding sheet 17A, and as shown in FIG. Part protrudes outward from the outer edges of the infrared ray absorption / color tone correction sheet 17B and the external light reflection preventing sheet 17C, and the metal pattern layer of the electromagnetic wave shielding sheet 17A is exposed, thereby providing a ground connection part as described later. It is configured.

  And this optical filter 17 is directly affixed on the flat display panel 3 by affixing the electromagnetic wave shielding sheet 17A side with the adhesive material 18 for filter bonding.

  A filter bonding adhesive 18 for bonding the optical filter 17 onto the flat display panel 3 is a transparent acrylic or silicon-based material, and is a substrate (PDP of the PDP) constituting the display surface of the optical filter 17 or the flat display panel 3. In this case, the difference between the refractive index of one or both of the front glass substrates) is 0.2 or less, for example, 1.4 to 1.6.

  Further, as the adhesive material 18 for laminating the filter, one having an adhesive strength of 3 kgf / inch or less by vertical peeling is used.

  Further, the thickness of the optical filter 17 is set to be 0.5 mm or more by adding the thickness of the adhesive material 18 for attaching the filter.

  As described above, the flat display panel 3 having the optical filter 17 attached to the display side surface is formed by the optical filter 17 by the inner flange portion 15A at the front end of the frame 15 attached to the front side peripheral portion of the chassis 2. The conductive gasket 16 in contact with the portion where the electromagnetic wave shielding sheet 17A is exposed is sandwiched between the chassis 2 and the chassis 2.

  A spring member may be used instead of the gasket.

  Reference numeral 9 denotes a front case of the display device.

  The flat display device is provided with a protective panel for protecting the display surface of the flat display panel 3 as in the prior art by attaching the optical filter 17 so as to be integrated with the display surface of the flat display panel 3. There is no need to provide it separately from the flat display panel 3, and the cost of the product can be reduced by reducing the number of parts and simplifying the support structure of the flat display panel 3.

  In this flat display device, the optical filter 17 is directly attached to the display surface of the flat display panel 3, and the refractive index of the adhesive material 18 for attaching the filter to which the optical filter 17 is attached is such that the optical filter 17 or The difference with respect to the refractive index of the substrate constituting the display surface of the flat display panel 3 is set to 0.2 or less, for example, 1.4 to 1.6 which is substantially the same as the refractive index of the glass substrate constituting the flat display panel 3. Thus, in the conventional display device, the reflection of light emitted from the flat display panel 3 (about 8%) caused by the formation of an air layer between the flat display panel and the protective panel is eliminated. Contrast of reflection of reflected light to the light emitting part It so can prevent the reduction.

  That is, in the conventional display device in which an air layer is formed between the flat display panel and the protective panel, the flat display panel is generally generated by the respective interfaces of the flat display panel and the protective panel facing the air layer. About 8% of light out of the light is reflected and returned into the panel. However, since the return light is irregularly reflected light, there is a possibility that the non-light emitting part adjacent to the light emitting part of the panel may be illuminated.

  In particular, in the PDP, a phosphor layer is formed in the panel, and the reflectance of the phosphor layer is about 30%. Therefore, the return light (reflected light from the interface of the flat display panel or the protective panel) is used. ) Is reflected by the phosphor layer, it appears that light is emitted even in the non-light emitting part, and the outline of the light emitting part is blurred, and the sharpness of the displayed image is lost. There is a risk that.

  In recent years, attempts have been made to reduce the black luminance in flat display panels. However, the effect of reducing the black luminance may be reduced by the influence of the reflection of the return light as described above. .

  The flat display device includes a filter-bonding adhesive 18 having an interface between the flat display panel 3 and the optical filter 17 having a refractive index of 0.2 or less with respect to the refractive index of the flat display panel 3 and the optical filter 17. By bonding, the reflection at the interface is suppressed, and the loss of sharpness of the image is prevented. Further, the black luminance of the flat display panel in which the black luminance is reduced is also reduced. The reduction effect is prevented from being reduced.

  Such an effect of reducing the sharpness of the image and an effect of preventing the reduction rate of the black luminance are reduced when the flat display panel 3 is a PDP, other than a display discharge that emits light for image formation (for example, Discharge discharge such as weakening the discharge intensity or reducing the number of discharges so that the luminance due to reset discharge, priming discharge, preliminary discharge such as address discharge not directly related to display) is 1 cd / m 2 or less. It is further increased by performing drive control.

  Further, the flat display device uses an acrylic or silicon-based adhesive material with a vertical peeling of 3 kgf / inch or less as the adhesive material 18 for bonding the filter, so that the flat display panel 3 and the optical device can be repaired. The substrate of the filter 17 can be peeled without being damaged.

  Further, by setting the thickness of the optical filter 17 to be 0.5 mm or more in addition to the thickness of the adhesive material 18 for attaching the filter, it is possible to maintain a shock-absorbing property against an external impact. As well as being able to do so, the flat display panel can be prevented from cracking.

  Further, the optical filter 17 is attached so that the electromagnetic wave shielding sheet 17A is on the flat display panel 3 side, whereby an infrared absorption / color tone correction sheet 17B containing a dye that easily deteriorates against heat and light and the flat display. Since a relatively stable shield member is interposed between the panel 3 and the panel 3, the influence of heat and light from the flat display panel 3 on the infrared absorption / color correction sheet 17B can be reduced. Become.

  It should be noted that by providing a component for reducing the transmittance between the electromagnetic wave shielding sheet 17A and the flat display panel 3, it is possible to relax the standard of appearance such as uneven blackening of the electromagnetic wave shielding sheet 17A.

  Further, the electromagnetic wave shielding sheet 17A of the optical filter 17 is formed to be slightly larger than the infrared ray absorption / color tone correction sheet 17B and the external light antireflection sheet 17C formed thereon, and the outer peripheral edge thereof is infrared absorption / color tone. By projecting from the outer periphery of the correction sheet 17B and the external light antireflection sheet 17C, the electromagnetic wave shielding sheet 17A can be easily grounded.

  The flat display device absorbs and relaxes external impact force by using a foam material having a hardness of 30 ° or less as the elastic sheet 14 that supports the flat display panel 3 on the chassis 2. Will be able to.

  In the flat display device, the flat display panel 3 is fixed on the chassis 2 without using an adhesive sheet as in the prior art, with a conductive gasket 16 interposed between the frame 15 and the chassis 2. By being clamped, it is easier to replace and recycle the flat display panel than when the flat display panel 3 is fixed with an adhesive sheet as in the prior art.

  And since the ground connection part formed in the outer edge part of the optical filter 17 is pinched | interposed through the conductive gasket 16, the panel fixation by the flame | frame 15 and the electrical connection with the optical filter 17 can be performed simultaneously. This makes it possible to reduce the cost of the product by reducing the number of parts.

  In the above example, the stacking order of the electromagnetic wave shielding sheet, the infrared ray absorption / color tone correction sheet, and the external light antireflection sheet in the optical filter is not limited to the example of FIG. The structure in which the interruption | blocking sheet | seat and the external light reflection prevention sheet | seat were laminated | stacked in order may be sufficient.

  In the example of FIG. 3, the panel 3 is sandwiched between the frame 15 and the chassis 2 via the gasket 16 and fixed to the chassis 2, but the foam material constituting the elastic sheet 14 An adhesive layer may be provided on both sides of the panel, and the panel may be fixed to the chassis by the adhesive layer.

[Example 2]
FIG. 6 is a plan view showing a configuration example of the optical filter in the second example of the embodiment of the present invention.

  In the optical filter 27 in this example, the vertical width of the electromagnetic wave shielding sheet 27A is larger than the vertical widths of the infrared ray absorption / color tone correction sheet 27B and the external light antireflection sheet 27C. The edges protrude outwardly from the infrared absorption / color tone correction sheet 27B and the external light antireflection sheet 27C, respectively, but the lateral width is lateral to the infrared absorption / color tone correction sheet 27B and the external light antireflection sheet 27C. It is the same size as the width of the direction.

  Cutouts 27Ba and 27Ca are formed at the same position in the center of the left and right side edges of the infrared ray absorption / color tone correction sheet 27B and the external light antireflection sheet 27C, and electromagnetic waves are blocked in the cutouts 27Ba and 27Ca. The edges of the sheet 27A are exposed.

  The optical filter 27 is grounded at the edge portion a1 that protrudes above and below the electromagnetic wave shielding sheet 27A and at the portion b1 that is exposed in the notches 27Ba and 27Ca.

  By configuring the optical filter 27 of the flat display device as described above, as shown by the wavy line in FIG. 6, the electromagnetic wave shielding sheet 27A and the infrared ray absorbing sheet 27A each formed into a strip shape and wound in a roll shape It becomes possible to manufacture the color tone correction sheet 27B and the external light antireflection sheet 27C by laminating them in the form of a band (in this case, the band-shaped infrared absorption / color tone correction sheet 27B and the external light antireflection sheet). 27C is preliminarily punched to form the cutouts 27Ba and 27Ca), which can greatly reduce the manufacturing cost of the optical filter 27.

  In this example, the cutouts 27Ba and 27Ca are formed at two locations on each of the upper edge portion and the lower edge portion of the infrared absorption / color tone correction sheet 27B and the external light antireflection sheet 27C. The notches Ba and 27Ca may be formed in one place, or may be formed in three or more places.

[Example 3]
FIG. 7 is a plan view showing a configuration example of the optical filter in the third example of the embodiment of the present invention.

  In the optical filter 37 in this example, the vertical width of the electromagnetic wave shielding sheet 37A is the same as the vertical width of the infrared ray absorption / color tone correction sheet 37B and the external light antireflection sheet 37C. The width is set to be smaller than the lateral width of the infrared absorption / color tone correction sheet 37B and the external light antireflection sheet 37C, and the right and left edges thereof are the infrared absorption / color tone correction sheet 37B and the external light. Each of the antireflection sheets 37C projects outward.

  Cutouts 37Ba and 37Ca are formed on the upper and lower edges of the infrared ray absorption / color tone correction sheet 37B and the external light antireflection sheet 37C, respectively, and the electromagnetic wave shielding sheet 37A is formed in the cutouts 37Ba and 37Ca. The edges of each are exposed.

  In this example, the notches 37Ba and 37Ca are formed at two locations on each of the upper edge portion and the lower edge portion of the infrared ray absorption / color tone correction sheet 37B and the external light antireflection sheet 37C. The cutouts 37Ba and 37Ca may be formed at one place each, or may be formed at three or more places.

  The optical filter 37 is grounded at the part a2 exposed in the notches 37Ba and 37Ca of the electromagnetic wave shielding sheet 37A and the edge part b2 projecting left and right.

[Example 4]
8 and 9 are plan views showing a configuration example of the optical filter in the fourth example of the embodiment of the present invention.

  As in the case of the optical filter 17 in the first embodiment described above, the optical filter 47 in this example has the vertical and horizontal dimensions of the infrared absorption / color tone correction sheet 47B and the external light antireflection sheet 47C of the electromagnetic wave shielding sheet 47A. The edge portion of the electromagnetic wave shielding sheet 47A projects outward from the outer edge portions of the infrared ray absorption / color tone correction sheet 47B and the external light antireflection sheet 47C. The pattern layer is exposed to form the ground connection portion s.

  Further, on the surface of the electromagnetic wave shielding sheet 47A of the optical filter 47, a black metal film or a film 47D that has been subjected to blackening treatment is formed, and an earth connection portion formed on the outer peripheral edge of the electromagnetic wave shielding sheet 47A. s is configured to be a so-called solid electrode.

  Then, an alignment mark M for bonding to an even number of flat display panels (in this example, two on both sides of the lower edge of the optical filter 47) is formed at an arbitrary position of the ground connection portion s. Has been.

  The alignment mark M is formed, for example, by punching the electromagnetic wave shielding sheet 47A into a round shape or a cross shape.

  The optical filter 47 in this example can suppress reflection of external light from the electromagnetic wave shielding sheet 47A by forming the black coating 47D on the electromagnetic wave shielding sheet 47A, thereby displaying an image to be displayed. The contrast can be improved.

  Further, since the alignment mark M is provided on the optical filter 47, the positioning when the optical filter 47 is bonded to the flat display panel by a technique such as image processing can be easily and accurately performed in the manufacturing process. To be able to do it.

2 ... Chassis (chassis member)
3 ... Flat display panel 14 ... Elastic sheet (foam)
15 ... Frame (side frame member)
15A ... inner flange 16 ... gasket 17, 27, 37, 47 ... optical filter (protective sheet)
17A, 27A, 37A, 47A ... Electromagnetic wave shielding sheet (electromagnetic wave shielding layer)
17B, 27B, 37B, 47B ... Infrared absorption / color tone correction sheet (infrared absorption and color tone correction layer)
17C, 27C, 37C, 47C ... External light antireflection sheet (external light antireflection layer)
18 ... Adhesive material for bonding filters (transparent adhesive material)
27Ba, 37Ba, 27Ca, 37Ca ... Notches (notches)
47D ... Black metal film or blackened film (black film)
s ... Earth connection M ... Positioning mark

Claims (8)

A flat display panel and an optical filter formed by being laminated on the display side surface of the flat display panel with a transparent adhesive and having an electromagnetic wave shielding layer laminated on the flat display panel side of the infrared absorption and color tone correction layer. In the flat display device provided,
A flat display device characterized in that an outer edge portion of the electromagnetic wave shielding layer of the optical filter is exposed from the infrared absorption and color tone correction layer, and the exposed portion is used as a ground connection portion.   The flat display device according to claim 1, wherein the transparent adhesive material has a refractive index of 1.4 to 1.6.   2. The flat display device according to claim 1, wherein a thickness of the optical filter attached to the flat display panel is 0.5 mm or more together with a thickness of the transparent adhesive material.   The flat display device according to claim 1, wherein the optical filter further includes an external light antireflection layer, and the electromagnetic wave blocking layer, the infrared absorption and color tone correction layer, and the external light antireflection layer are stacked in this order.   5. The outer edge portion of the electromagnetic wave blocking layer is exposed by forming the electromagnetic wave blocking layer so that the area of the electromagnetic wave blocking layer is larger than the areas of the infrared absorption and color correction layer and the external light antireflection layer. A flat display device according to claim 1.   The flat display device according to claim 4, wherein a cutout portion is formed in an outer edge portion of the infrared absorption and color tone correction layer and the external light antireflection layer, and the electromagnetic wave shielding layer is exposed in the cutout portion.   The flat display device according to claim 1, wherein a black film is formed on the ground connection portion, and the ground connection portion is provided in a non-display area of an outer edge portion of the flat display panel.   The flat display device according to claim 7, wherein an alignment mark is formed on the black film.

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